Definition of: i, I

(ī) noun plural i's, I's or Is, eyes (īz)
1. The ninth letter of the English alphabet: from Phoenician yod, Greek iota, Roman I.
2. Any sound of the letter i. See ALPHABET.
—symbol
1. The Roman numeral one: written I or i. See under NUMERAL.
2. Chem. Iodine (symbol I).